Grain refinement of AZ91D magnesium alloy by MgCO3

Chen, Ti Jun; Jiang, Xue-Yin; Ma, Ying; Wang, Rui Quan; Yuan, Hao

doi:10.1590/s1516-14392011005000017

Cited by 12 publications

(3 citation statements)

References 26 publications

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“…2935) In the previous researches performed by Chen et al, the grain sizes increased significantly with the extension of holding time for the AZ91 alloy inoculated by MgCO 3 and SiC, i.e., obvious inoculant fading phenomenon was observed. 36,37) They believed that the number of effective nucleant substrates was decreased when the holding time was extended. However, no evidence was provided in their studies.…”

Section: Introductionmentioning

confidence: 99%

Inoculant Fading-Resistance of Fe-Bearing Mg–3%Al Alloys Refined by Carbon Combining with Calcium Addition

Wen

et al. 2018

Mater. Trans.

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Mg3%Al alloys containing different trace Fe contents were treated by carbon combining with Ca inoculation. The holding time after being inoculation was adjusted from 5 to 80 min. The effect of holding time on grain refinement and the structures of nucleating particles were systematically investigated. Significant grain refinement is obtained for the Mg3%Al alloys containing trace Fe refined by carbon combining with Ca inoculation. The grain size keep stable with prolonging the holding time and exhibit significant fading-resistance. The duplex-phase particles of AlFe coated with AlC-rich phase could be easily observed and they should actually act as potent nuclei for Mg grains. The Ca content in the AlC-rich shell is obviously higher than that in the Mg matrix. The segregation of Ca on the surfaces of different phases contributes to the formation of duplex-phase particles and keeps the duplex phase structure particles stable. Consequently, no inoculant-fading of carbon-inoculation occurred due to the high stability of the duplex phase structure particles.

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Section: Introductionmentioning

confidence: 99%

Inoculant Fading-Resistance of Fe-Bearing Mg–3%Al Alloys Refined by Carbon Combining with Calcium Addition

Wen

et al. 2018

Mater. Trans.

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“…Also, investigated by HuiHan [38] And the grain refinement mechanism is attributed to Al4C3 can act as the efficiently heterogeneous nuclei of primary α-Mg and decrease the degree of undercooling the primary α-Mg phase. And another study by TiJun Chen [39], indicates that MgCo3 can decrease its grain size from 311 to 53 µm. Correspondingly, the tensile properties are improved.…”

Section: By Carbon Inoculationmentioning

confidence: 99%

Grain Refinement OfAZ91MgCasAlloy (Review Paper)

Eljaafari

2023

International Journal of Materials Technology and Innovation

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Grain refinement is an established technique that reduces the grain size of material with the direct intention of improving its finished properties or characteristic. The main objective of grain refinement is to produce a fine, uniform, and equiaxed grain structure. On the other hand, grain refinement of cast magnesium can be achieved by two methods represented by increasing the cooling rate and adding a chemical grain refiner. AZ91 is a cast magnesium alloy used to produce die-cast components. In contrast, the basic microstructure of this alloy consists of a primary αphase in which the aluminum-rich βphase (Mg17 Al12) is precipitated along grain boundaries in cast magnesium alloy. Cast AZ91 alloy generally exhibits low strength and ductility due to the network-like eutectic β-Mg17 Al12 distributed at the grain boundaries. In this review article, the research methods of grain refinement and its effect on the characterization of microstructure and mechanical properties of AZ91 magnesium cast alloy.

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“…The key of this method is to prepare cast ingots with fine equiaxed grains. Unfortunately, for the most commonly-used magnesium alloy of AZ91D, there is still no a commercially-used grain refining technique [4][5][6] . The result from the authors' previous investigation indicates that its grain size can be decreased from 422 µm to 79 µm after being refined by an Al-Ti-B master alloy that has been commercially used to aluminium alloys 7 .…”

Section: Introductionmentioning

confidence: 99%

Semisolid microstructure evolution of AZ91D magnesium alloy refined by Al-Ti-B

Chen

Wang

et al. 2011

Mat. Res.

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The microstructural evolution and corresponding phase transformations have been investigated during partial remelting of AZ91D magnesium alloy refined by Al-Ti-B master alloy. The effect of heating temperature on semisolid microstructure has also been discussed. The results indicate that the microstructural evolution process includes four stages, the initial rapid coarsening, structure separation, spheroidization accompanied by coarsening and the final coarsening. Two or more equiaxed dendrites in the as-cast microstructure evolve into one spheroidal primary particle in the semisolid microstructure through the former three stages. The initial rapid coarsening results from the reaction of b→a, the structure separation is due to the a + b→L and a→L, the spheroidization is attributed to the a→L and the final coarsening is ascribed to the two reverse reactions of a→L and L→a. Rising the heating temperature during partial remelting is beneficial for obtaining small and spheroidal primary particles.

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Grain refinement of AZ91D magnesium alloy by MgCO3

Cited by 12 publications

References 26 publications

Inoculant Fading-Resistance of Fe-Bearing Mg–3%Al Alloys Refined by Carbon Combining with Calcium Addition

Inoculant Fading-Resistance of Fe-Bearing Mg–3%Al Alloys Refined by Carbon Combining with Calcium Addition

Grain Refinement OfAZ91MgCasAlloy (Review Paper)

Semisolid microstructure evolution of AZ91D magnesium alloy refined by Al-Ti-B

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